Introduction
Poland is a four operator market with providers T-Mobile, Orange, Plus and Play. Network utilisation is high due to very low data rates compared to some of Poland's neighbours. This page features mast sites I saw on a trip to Poznań.
Poznań, ul. Wierzbięcice 1: Orange and T-Mobile 4CA and Plus 2CA
Overall view

On the left are dual band Huawei antennas and Ericsson RRUs 12, likely for Plus GUL09, L18. On the right are Huawei RRUs, which will be for Orange and T-Mobile GU09, UL21, L08, L18, L26.

Closeup of Orange and T-Mobile Equipment. Huawei (L08+L26) and Powerwave (remainder) antennas. This is a high capacity configuration with quadruple carrier aggreagtion (4CA possible (L08_L18_L21_L26).

Closeup of Plus equipment. Kathrein antennas and Ericsson RRUS12.
Ul. Niezłomnych 1: Orange and T-Mobile 2CA, Play 4CA
Overall view

T-Mobile and Orange are using the Kathrein antennas and Huawei RRUs for UG09, UL21, L18. The pseudo hidden installation is for Play GU09, L18, UL21, L08, L26.
Ul. Półwiejska 26: Orange and T-Mobile 3CA
Overall view

Huawei dual low band antennas for L08, UG09 and dual high bands for L18, UL21.
Antenna closeups

Huawei Antennas used by Orange and T-Mobile
Ul. Gwarna 13: Orange and T-Mobile 4CA, Plus
Overall Building

Gwarna 13 mast with Orange, T-Mobile and Plus. Orange and T-Mobile are on the left with Huawei antennas radiating UG09, L08, L18, UL21, L26, another 4CA site and Plus on the right with Ericsson RRUS12 visible, G09, U21.
Orange and T-Mobile Antenna Closeups

Huawei triple band antennas used by Orange

A view of the tags
Plus antennas

Plus equipment on Gwarna 13: RRUS12 and dual band antennas
Ul. Zielona 8 Orange and T-Mobile 4CA
Antennas

Huawei and Kathrein Antennas used by Orange and T-Mobile UG09, L08, L18, UL21, L26.
Huawei Remote Radios

Huawei RRUs used by Orange and T-Mobile
Hotel De Silva (Piekary 5): Play 4CA
Closeup

Huawei quad band antennas and Huawei RRUs are prominently visible. Play GU09, UL21, GL18, L08, L26.
Pl.Wielkopolski 4: Play 4CA
Closeup

Quad band Huawei antennas for GU09, UL21, L08, L18, L26.
Stary Rynek 41: Play 4CA
Hidden!

A fully featured Play site with UG09, L08, L18, UL21, L26 on dual band Huawei antenna.
Stary Rynek 65: Plus
Hidden!
Hidden!

Plus hidden Kathrein antenna on Stary Rynek. LTE is L18.
Ul. 23 Lutego 26: Orange and T-Mobile 4CA
Overall

Orange and T-Mobile 4CA site with Huawei, Powerwave, Kathrein antennas and Huawei RRUs. UG09, L08, L18, UL21, L26.

Closeup of the antennas and RRUs. Four feeder 2600MHz going to the left panel, alongside likely L08, with the remainder on the other antennas.
Wiosny Ludów 2 Shopping Arcade: Orange, T-Mobile and Play 4CA
Orange and T-Mobile

Closeup of the Orange and T-Mobile Huawei and Kathrein antennas for 4CA. UG09, L08, L18, UL21, L26
Play

Play Poland on the roof. UG09, L08, L18, UL21, L26
Plac Wolnoski: Plus

Plus GU09, U21, L18 using old dual band and single band Kathrein antennas.
Radio Eska

Plus GUL09, L18 mast on Radio Eska using dual band Kathrein antennas. The old panel is for Nordisk CDMA.
Ul. Półwiejska 23: Plus
Closeup

Plus U21/L18 I think.
Zachodonia 15: Orange and T-Mobile 4CA

Orange and T-Mobile 4CA site on Zachodonia 15 with Huawei and Kathrein antennas and Huawei RRUs. Usual UG09, UL21, L18, L08, L26.
Ul Głogowska 14: Orange and T-Mobile 4CA

Orange and T-Mobile 4CA site on Ul Głogowska 14 with Huawei, Powerwave and Kathrein antennas and Huawei RRUs. Usual UG09, UL21, L18, L08, L26.
Rynek Wildecki: Plus 3CA
Angle 1

Plus triple 4G carrier site with various Ericsson RRUs, Kathrein dual and single band antennas.
Angle 2

ERS visible.
Rynek Wildecki: Orange and T-Mobile 3CA

Essentially like the 4CA sites but without L08.
Przemysłowa 39: Play 4CA
A rather grainy pic!

Another Play 4CA site.
Św Marcin Microcells
Orange and T-Mobile Microcell

Orange and T-Mobile Poland Microcell complete with GU09 and L26. Huawei RRU visible.
Plus Microcell

Plus U09 Microcell with Ericsson RRUS12.